Fabrication And Property Research On Oil Layer Sampling Micro/Nanomotors

Petroleum,so called the "blood" of modern industry,is the power and source of national economic and social development.With the continuous development of oil reservoir resources,the main oil fields in China have gradually entered the middle and late stages of oil exploration.The unexploited oil and gas resources in the old oil fields are mainly concentrated in low permeability micro-pore or even nano-pore stratum structure,which makes it difficult to detect and exploit.In recent years,functional micro-nano structures,represented by micro/nanomotors,have become an important direction of global scientific and technological development.Due to their different material and functional characteristics from those at macro scale,micro/nanomotors can provide new solutions and ideas for the problems in the oil field recovery.Therefore,the development of oil layer precise sampling technology based on micro/nanomotor is quite important.To expanse the applicability of micro-nano motor,and the basic research on movement mechanism of reservoir sampling micro/nanomotor facing complex stratum environment are of indispensable strategic significance for maintaining national energy security and developing security.This study is mainly based on the research of micro/nanomotors under existing laboratory conditions.According to the real stratum environment,ultrasonic field is selected as the propelling mode of oil layer sampling micro/nanomotors,and two suitable motor configurations are selected according to the characteristics of ultrasonic propulsion.Janus micro/nanomotors and cone tube micro-motors are prepared by physical vapor deposition and electrochemical deposition,respectively.Two-dimensional micro-channel model and three-dimensional artificial core model were prepared by using bottom-up stereolithography method.Based on the mechanism of ultrasonic propulsion,the theoretical model of ultrasonic propelling micro/nanomotor movement is established.The movement behavior of micro/nanomotor in the flow field is studied by simulation,and the influence of certain parameters on its movement behavior is studied.The movement behavior of micro/nanomotor in the artificial core model is studied by experimental method and verified by simulation in the blocked flow field.According to the characteristic structure in the oil field,the typical heterogeneous channel model in the sandstone oil layer is designed,and through the method of experiment and simulation,it is proved that the micro/nanomotor can enter the micro with high-flow-resistance channel under the propulsion of ultrasound;In addition,the functional route of the micro/nanomotor for the stratum sampling is designed,and its ability to capture oil drops is verified by simulation.